Bhavbhuti,

AddObject() puts the object into the containership hierarchy. This allows and is required for the object to be visible and to participate in the UI event loop in the case of a form.

assuming your form has a property LabelX:

thisform.LabelX = CreateObject( "label" )

You can not make this label visible, nor will it respond to mouse clicks. The label object itself does not have a valid object reference in the .Parent property. You are responsible to set thisform.LabelX = .null. at some point during the destruct sequence to properly clean up the object. The form.Objects[] collection does not contain a reference to the label. The same comments apply if you use NewObject() instead of CreateObject().

thisform.AddObject( "LabelY", "label" )
thisform.Visible = .t.

The object LabelY can receive UI events, it's .Parent property references the form. You can access the label via the form.Objects[] collection. When the form destructs it will automatically take care of the destruction of the object.

>Being a relative newbie, I have used these 3 in different situations but without much insight, because they worked I kept them.
>
>What are the differences (except for parameters) and when are they to be used (in proper context)